Abstract:
PROBLEM TO BE SOLVED: To certainly and structurally simply assure that heat exchange medium flows downward around catalyst tubes and accordingly in parallel with a reaction mixture guided similarly downward via the catalyst tubes in a reactor having a bundle of catalyst tubes and an annular conduit into which the reaction mixture is guided via the catalyst tubes and the heat exchange medium is guided via a space surrounding the catalyst tubes and on which a jacket opening for feeding or discharging the heat exchange medium to both ends of the reactor by a single or a plurality of pumps is formed. SOLUTION: The pump has oblique impellers and a restriction gap in a longitudinal direction of a pump shaft is formed inside the heat exchange medium on discharge side of the pump for sealing and bearing the pump shaft and for reducing axial moves of the oblique impellers. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide the reactor having a heat exchanger plate, especially flow-technically preferable, freely adaptable to the temp. profile of different chemical reactions and capable of being easily produced in terms of structural technique. SOLUTION: This reacter 1 is provided with the heat-exchanger plates 2 through which a heat-transfer agent flows and arranged in the longitudinal direction of the reactor 1 away from one another, the feeder and discharge 5 and 6 for the heat-exchange agent with respect to the heat-exchanger plates 2 and an intermediate space between the heat-exchanger plates 2 through which a reaction medium flows. In this case, heat-exchanger plates 2 are radically arranged in the reactor 2 while securing the place for an internal space in the center.
Abstract:
The invention relates to a method for producing phthalic acid anhydride by means of heterogeneously catalysed gas phase oxidation, in a reactor comprising an element for guiding a reaction mixture in at one reactor end and an element for guiding the product mixture out at the opposite reactor end. The reactor also comprises devices for carrying off the reaction heat, through which heat exchanger agents flow and which are configured as heat exchanger plates, these devices being located in the inner chamber of the reactor.
Abstract:
The invention relates to a multi-tube fixed-bed reactor and to the use of a reactor of this type for carrying out catalytic gas phase reactions, especially for carrying out exothermic or endothermic catalytic gas phase reactions such as producing phthalic anhydride (PSA), acrylic acid (AA), methacrylic acid (MAA), acrolein, maleic anhydride (MSA), glyoxal, phosgene, hydrogen cyanide or vinyl formamide (VFA). According to the invention, in the case of larger reactors where a considerable reaction heat is produced or required and must be dissipated as a result of the numerous reaction tubes (17), the ratio of tube distribution t to tube outer diameter d?a? is made dependant on the reactor diameter or the tube bundle diameter d?RBa?. If the outer diameter of the reaction tube bundle (18) is more than 4 metres, a ratio of tube distribution t to tube outer diameter d?a? of at least 1.3 is preferred.
Abstract:
The invention relates to a method for the production of maleic acid anhydride by heterogeneously catalysed gas phase oxidation in a reactor. Said reactor has a reaction mixture inlet at one end of the reactor and a product mixture outlet at the opposite end of the reactor and, within the reactor volume, a device for removal of the heat of reaction, which is arranged in the form of heat exchanger plates, with a heat exchange agent flowing through said plates.
Abstract:
The invention relates to a reactor (1) comprising a bundle of contact tubes (2). A heat-exchanging medium is guided through the area surrounding the contact tubes. Both ends of the reactor have annular ducts (3,4) with jacket orifices (5,6) for supplying or educting a heat-exchanging medium by means of at least one pump, optionally transferring the heat-exchanging medium or a partial current of the heat-exchanging medium via at least one external heat exchanger. The heat exchanging medium is fed to the lower annular duct (4) and is returned to the pump(s) via the upper annular duct (3). Deviating discs (7) alternately leave open a passage diameter at the centre or at the edge of the reactor. The lower annular duct (4) is split into two zones by means of a horizontal partition (8), said two zones communicating with each other via preferably homogeneously divided openings (9) with adjustable passage diameters.
Abstract:
The invention relates to a reactor (1) comprising a bundle of contact tubes (2). A heat-exchanging medium is guided through the area surrounding the contact tubes. Both ends of the reactor have annular ducts (3,4) with jacket orifices (5,6) for supplying or educting a heat-exchanging medium by means of at least one pump, optionally transferring the heat-exchanging medium or a partial current of the heat-exchanging medium via at least one external heat exchanger. The heat exchanging medium is fed to the lower annular duct (4) and is returned to the pump(s) via the upper annular duct (3). Deviating discs (7) alternately leave open a passage diameter at the centre or at the edge of the reactor. The lower annular duct (4) is split into two zones by means of a horizontal partition (8), said two zones communicating with each other via preferably homogeneously divided openings (9) with adjustable passage diameters.
Abstract:
The invention relates to a reactor for partial oxidation of a fluid reaction mixture in the presence of a heterogeneous particulate catalyst. Said reactor comprises one or several cuboid heat-transfer sheet modules (1) which are each composed of two or several right-angled heat-transfer sheets (2), arranged parallel to each other such as to form a slit (3) which can be filled with the heterogeneous particulate catalyst and through which the fluid reaction mixture flows, the heat of reaction being absorbed by a heat carrier which flows through the heat-transfer sheets (2) and at least partially evaporates. Said reactor also comprises a mainly cylindrical envelope (4, 15, 16) which depressurizes the heat-transfer sheet modules and fully surrounds said modules, said envelope being composed of a cylinder casing (4) and of caps (15, 16), closing said casing at both ends, the longitudinal axis of which extends parallel to the plane of said heat-transfer sheets (2). Said reactor finally comprises one or several sealing elements (7, 23), arranged so that the fluid reaction mixture flows only through the slit (3), except through the reactor interior spaces, defined by the caps (15, 16).
Abstract:
A REACTOR IS PROPOSED FOR PARTIAL OXIDATIONS OF A FLUID REACTION MIXTURE IN THE PRESENCE OF A HETEROGENEOUS PATRICULATE CATALYST, COMPRISING ONE OR MORE CUBOIDAL THERMOPLATE MODULES (1) WHICH ARE EACH FORMED FROM TWO OR MORE RECTANGULAR THERMOPLATES (2) ARRANGED PARALLEL TO EACH OTHER WHILE IN EACH CASE LEAVING A GAP (3) WHICH CAN BE FILLED WITH THE HETEROGENEOUS PARTICULATE CATALYST AND IS FLOWED THROUGH BY THE FLUID REACTION MIXTURE; THE HEAT OF REACTION BEING ABSORBED BY A HEAT CARRIER WHICH FLOWS THROUGH THE THERMOPLATES (2) AND THUS AT LEAST PARTLY EVAPORATES, AND ALSO HAVING A PREDOMINANTLY CYLINDRICAL SHELL (4,15,16) WHICH RELEASES THE PRESSURE AT THE THERMOPLATE MODULES, COMPLETELY SURROUNDS THEM AND COMPRISES A CYLINDER JACKET (4) AND HOODS (15,16) WHICH SEAL IT AT BOTH ENDS AND WHOSE LONGITUDINAL AXIS IS ALIGNED PARALLEL TO THE PLANE OF THE THERMOPLATES (2), AND ALSO HAVING ONE OR MORE SEALING ELEMENTS (7, 23) WHICH ARE ARRANGED IN SUCH A WAY THAT THE FLUID REACTION MIXTURE, APART FROM FLOWING THROUGH THE REACTOR INTERIOR SPACES BOUNDED BY THE HOODS (15,16), ONLY FLOWS THROUGH THE GAP (3).
Abstract:
A process for preparing formaldehyde by gas-phase oxidation of methanol vapor by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst comprising iron and molybdenum, wherein the process is carried out in a reactor ( 1 ) having heat-exchange plates ( 2 ) which are arranged in the longitudinal direction of the reactor ( 1 ) and have a spacing between them and through which a heat transfer medium flows, inlet and outlet facilities ( 3, 4 ) for the heat transfer medium to the heat-exchange plates ( 2 ) and also gaps ( 5 ) between heat-exchange plates ( 2 ) in which the fixed-bed catalyst is present and into which the methanol vapor and the gas stream comprising molecular oxygen are passed, is described.